Granted Patent B2

US 12,645,491 · App. 18/574,353 · Granted Jun 2, 2026

Inventors: Moshe Chocron (Ashdod, IL); Alexander Winokur (Ramat Gan, IL)

Assignee: HYPERPLANE LTD.

G06F9/4862G06F2209/509

Abstract

Claims (44)

1 . A method, comprising:

receiving, by a first machine, a request to migrate an application that is executing in a memory of the first machine, wherein the application comprises a first instance of a dynamic library having one or more functions;

generating a log comprising resources allocated to and deallocated from the first instance of the dynamic library in response to executing the application, wherein generating the log comprises recording, by a set of wrapped system library functions, calls from the first instance of the dynamic library to system library functions that allocate and deallocate resources;

suspending execution of the application while the first instance of the dynamic library has a current state;

unloading the first instance of the dynamic library from the memory;

identifying, subsequent to unloading the first instance of the dynamic library, any of the resources that were allocated to the first instance of the dynamic library and that are still pending;

deallocating the identified resources so as to define a cleaned version of the application that does not comprise any of the allocated resources;

migrating the cleaned version of the application to a second machine;

resuming execution of the application on the second machine so as to link the application to a second instance of the dynamic library; and

replaying the log so as to bring the linked second instance of the dynamic library on the second machine to the current state.

2 . The method according to claim 1 , wherein the first instance of the dynamic library controls a stateful hardware peripheral.

3 . The method according to claim 2 , wherein the stateful hardware peripheral comprises a hardware accelerator.

4 . The method according to claim 3 , wherein the hardware accelerator comprises a Graphics Processing Unit (GPU) having a GPU memory.

5 . The method according to claim 4 , wherein the source machine comprises a first GPU, wherein the second machine comprises a second GPU, wherein migrating the cleaned version of the application comprises copying data stored in the GPU memory of the first GPU to the GPU memory of the second GPU, and wherein the current state comprises the data stored in the GPU memory of the first GPU.

6 . The method according to claim 2 , wherein the current state comprises a current software state, wherein the first machine comprises a first stateful hardware having a current hardware state upon suspending the application, wherein the second machine comprises a second stateful hardware, and wherein replaying the logs brings the second stateful hardware to the current hardware state.

7 . The method according to claim 1 , wherein a given resource comprises a heap memory allocation, and wherein the current state comprises the heap memory allocation and data stored in the allocated heap memory.

8 . The method according to claim 1 , wherein a given resource comprises a dynamic memory allocation, and wherein the current state comprises the dynamic memory allocation and data stored in dynamically allocated memory.

9 . The method according to claim 1 , wherein a given resource comprises a currently allocated device handle, and wherein the current state comprises the currently allocated device handle.

10 . The method according to claim 1 , wherein a given resource comprises a currently allocated file handle, and wherein the current state comprises the currently allocated file handle.

11 . The method according to claim 1 , wherein a given resource comprises a thread, and wherein the current state comprises the thread.

12 . The method according to claim 1 , wherein a given resource comprises a lock, and wherein the current state comprises the lock.

13 . The method according to claim 1 , wherein the application comprises a set of wrapper functions that call the functions in the first instance of the dynamic library.

14 . The method according to claim 13 , wherein suspending the application comprises suspending the application upon detecting that none of the wrapper functions are currently executing.

15 . The method according to claim 1 , wherein identifying the resources comprises recording a first state of the resources prior to loading the dynamic library, recording a second state of the resources upon loading the dynamic library, recording a third state of the resources upon suspending execution of the application, recording a fourth state of the resources upon unloading the dynamic library, wherein the fourth state of the resources comprises log entries in the log comprising resource allocations and deallocations between second and third state, and analyzing the first, the second, the third, the fourth recorded states.

16 . The method according to claim 15 , wherein recording a given state comprises generating a list of the resources.

17 . The method according to claim 15 , wherein recording the second state comprises computing a difference in the resource allocations between the first and the second recorded states, wherein recording the third state comprises adding, to the computed difference, the resource allocations recorded in the log, and wherein recording the fourth state comprises computing a difference in resource allocations between the third recorded state unloading the first instance of the library, and subtracting the difference from resources allocated in the third recorded state.

18 . The method according to claim 1 , wherein the resources that are still pending comprise the resources that are still in the memory, and wherein deallocating the identified resources comprises deallocating the identified resources from the memory.

19 . A source computer, comprising:

a memory; and

one or more processors configured

to receive a request to migrate an application that is executing in the memory of the source computer, wherein the application comprises a first instance of a dynamic library having one or more functions,

to generate a log comprising resources allocated to and deallocated from the first instance of the dynamic library in response to executing the application, wherein generating the log comprises recording, by a set of wrapped system library functions, calls from the first instance of the dynamic library to system library functions that allocate and deallocate resources,

to suspend execution of the application while the first instance of the dynamic library has a current state, to unload the first instance of the dynamic library from the memory,

to identify, subsequent to unloading the first instance of the dynamic library, any of the resources that were allocated to the first instance of the dynamic library and that are still pending,

to deallocate the identified resources so as to define a cleaned version of the application that does not comprise any of the allocated resources, and

to migrate the cleaned version of the application to a destination computer, so that upon the destination computer resuming execution of the application and linking the application on the destination computer to a second instance of the dynamic library, the destination computer replays the log so as to bring the linked second instance of the dynamic library to the current state.

20 . A computer software product for controlling operation of a computer, comprising a non-transitory computer-readable medium, in which program instructions are stored, which instructions, when read by a computer, cause the computer:

to receive, by a first machine, a request to migrate an application that is executing in a memory of the first machine, wherein the application comprises a first instance of a dynamic library having one or more functions;

to generate a log comprising resources allocated to and deallocated from the first instance of the dynamic library in response to executing the application, wherein generating the log comprises recording, by a set of wrapped system library functions, calls from the first instance of the dynamic library to system library functions that allocate and deallocate resources;

to suspend execution of the application while the first instance of the dynamic library has a current state;

to unload the first instance of the dynamic library from the memory;

to identify, subsequent to unloading the first instance of the dynamic library, any of the resources that were allocated to the first instance of the dynamic library and that are still pending;

to deallocate the identified resources so as to define a cleaned version of the application that does not comprise any of the allocated resources; and

to migrate the cleaned version of the application to a destination machine, so that upon the destination machine resuming execution of the application and linking the application on the destination machine to a second instance of the dynamic library, the destination machine replays the log so as to bring the linked second instance of the dynamic library to the current state.

Assignments (1)

Continuity (2)

References Cited (32)